<template>
    <div class="todo-footer" v-show="total">
        <label>
            <!-- <input type="checkbox" :checked="isAll" @click="checkAll"/> -->
            <input type="checkbox" v-model="isAll"/>
        </label>
        <span>
            <span>已完成{{ todoTotal }}</span> /全部{{ total }}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成</button>
    </div>
</template>

<script>
export default {
    name: 'MyFooter',
    props: ['todos', 'checkAllTodo', 'clearAllTodo'],
    computed:{
        total(){
            return this.todos.length
        },
        todoTotal(){
            return this.todos.reduce((pre, todo)=> pre + (todo.done ? 1 : 0),0)
        },
        isAll:{
            get(){
                return this.total === this.todoTotal && this.todos.length > 0
            },
            set(value){
                this.checkAllTodo(value)
            }
        }
    },
    methods:{
        // checkAll(e){
        //     this.checkAllTodo(e.target.checked)
        // },
        clearAll(){
            this.clearAllTodo()
        }
    }
}
</script>

<style lang="less" scoped>
   /* footer */
   .todo-footer {
        height: 40px;
        line-height: 40px;
        padding-left: 6px;
        margin-top: 5px;
    }

    .todo-footer label{
        display: inline-block;
        margin-right: 20px;
        cursor: pointer;
    }

    .todo-footer label input {
        position: relative;
        top: -1px;
        vertical-align: middle;
        margin-right: 5px;
    }

    .todo-footer button{
        float: right;
        margin-top: 5px;
    }
</style>